I doubt that, once the Karousel was installed, you’d crave the older bearing.
Most of the people who've fitted it have raved about it just as you are so I'm inclined to think it's good. I'm just aware that the situation with the Cirkus was similar. I had that fitted and I was impressed with it myself at first. There were very few dissenting voices and it was a while before I realized that I too wasn't enjoying the deck as much.
Also, it's not cheap. £750 is a lot if it turns out to be a mistake.
I'm in no hurry. I'll just keep my eye on things and maybe get one eventually.